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Chlamydia psittaci detected at a live poultry wholesale market in central China

BMC Infectious Diseases volume 24, Article number: 585 (2024) Cite this article

Abstract

Background

We investigated the presence of Chlamydia psittaci in poultry and the environment in live poultry wholesale markets in Changsha during 2021–2022 and conducted a phylogenetic analysis to understand its distribution in this market.

Methods

In total, 483 samples were analyzed using real-time polymerase chain reaction and 17 C. psittaci-positive samples using high-throughput sequencing, BLAST similarity, and phylogenetic analysis.

Results

Twenty-two out of 483 poultry and environmental samples were positive for C. psittaci (overall positivity rate: 4.55%) with no difference in positivity rates over 12 months. Chlamydia psittaci was detected at 11 sampling points (overall positivity rate: 27.5%), including chicken, duck, and pigeon/chicken/duck/goose shops, with pigeon shops having the highest positivity rate (46.67%). The highest positivity rates were found in sewage (12.5%), poultry fecal (7.43%), cage swab (6.59%), avian pharyngeal/cloacal swab (3.33%), and air (2.29%) samples. The ompA sequences were identified in two strains of C. psittaci, which were determined to bear genotype B using phylogenetic analysis. Thus, during monitoring, C. psittaci genotype B was detected in the poultry and environmental samples from the poultry wholesale market in Changsha.

Conclusions

To address the potential zoonotic threat, C. psittaci monitoring programs in live poultry markets should be enhanced.

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Background

Psittacosis is a zoonotic disease caused by the pathogen Chlamydia psittaci, which was first isolated from parrots and subsequently from 460 other bird species, including pigeons, ducks, turkeys, gulls, and acacia birds. Chlamydia psittaci can cause lung infections in humans directly through inhalation or indirectly through contact with carrier birds or their secretions [1,2,3,4,5]. This disease is also clinically known as ornithosis [6]. With no specific clinical manifestations, most human patients have a sudden onset of the disease and show symptoms, including chills, fever, coughing, and chest pain, which can progress to pneumonia. However, some patients may have a slow disease onset with occult infection [4, 7]. The lack of timely diagnosis and treatment of this disease can lead to mortality.

Chlamydia psittaci infections in humans are well-documented [7,8,9]. Most reported human C. psittaci infection cases are attributed to close contact with poultry [10,11,12,13,14,15,16,17,18]. To date, the largest psittacosis outbreak was reported in the United States in August 2018, with 82 poultry processing plant workers diagnosed with C. psittaci infection [19]. In 2020, a C. psittaci outbreak involving 22 human-to-human transmission cases occurred at a duck meat processing plant in Shandong, China [20]. In September 2019, an outbreak of clustered human C. psittaci infection occurred in Changsha, with all ten cases involving vendors selling poultry in the live poultry market (LPM); however, C. psittaci was not detected in the market environment [21].

Chlamydia psittaci can be transmitted across species via various routes, including direct contact with infected birds, indirect contact with objects contaminated with the bacterium, and inhalation or ingestion of aerosols or water contaminated with C. psittaci [10, 12, 19, 21,22,23]. Poultry premises, including LPMs, are the primary locations where individuals come in contact with poultry. Studies have also shown that environmental contamination in LPMs is a key factor in the transmission of infections to humans. For instance, when avian influenza subtype H7N9 contaminates an LPM, the human populations exposed to it are at risk of infection with the subtype [24,25,26]. Wang et al. [27] assessed the effectiveness of various LPM interventions in reducing transmission of H7N9 virus across five annual waves during 2013–2018 in China, especially in the final wave.

Four LPM interventions led to a mean reduction of 34–98% in the daily number of infections in wave 5. Notably, permanent closure resulted in the most effective reduction in human infection with the H7N9 virus, followed by long-period, short-period, and recursive closures in wave 5 [27].

As psittacosis is not classified as a notifiable infectious disease in China, no unified monitoring and reporting system has been established for cases of human infection and environmental contamination caused by C. psittaci in LPMs. However, in recent years, data from epidemiologic investigations have shown that environmental exposure to C. psittaci poses a significant risk factor for the onset of the corresponding zoonotic disease in humans [28, 29], implying the need to monitor these markets for early intervention.

Therefore, in this study, we selected a sizeable live poultry wholesale market (LPWM) in Changsha, a city in central China, to survey C. psittaci in poultry and the environment.

Methods

LPWM sampling points

Changsha (27°51ʹ–28°41ʹ N, 111°53ʹ–114°15ʹ E) is the capital city of Hunan Province, China. The sampling site selected in the present study was an LPWM supplying approximately 30,000 live poultry of various types, originating from all over the country, such as pigeons, local chickens, Luosi chickens, spot-billed ducks, Muscovy ducks, Peking ducks, and black and brown geese. The LPWM supplies live poultry to small- and medium-sized local live poultry (farmer) markets on a wholesale basis. The wholesale market consists of two levels. The upper level contains shops that sell mainly poultry, including pigeons and chickens, whereas the lower level contains shops that sell waterfowl, including ducks and geese. The market consists of 56 shops that can be further divided into large shops, each covering an area of approximately 300 m2 and selling approximately 1,500–2,000 birds per day, and small shops, each covering an area of approximately 80 m2 and selling approximately 300–400 birds per day. The designated operating hours for these shops span from 22:00 to 11:00 the next day, and unsold poultry is collectively culled on the same day. The LPWM sampling locations are shown in Fig. 1.

Fig. 1
figure 1

Geolocation of the live poultry wholesale market in Changsha city from China

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LPWM poultry and environmental sample collection

Over a 12-month period (2021–2022), five shops were randomly selected for sampling every 2 months. Sampling was conducted between 09:00 and 12:00. Poultry (pharyngeal/ cloacal swabs and poultry feces) and environmental samples (air, sewage, water used for washing slaughtered poultry, poultry drinking water, and cage swabs) were collected using General Bacterial Sampling kits (Yocon Biotechnology, Beijing, China). The kits also include a sampling solution, which consists of sodium chloride, potassium chloride, calcium chloride, magnesium chloride, potassium dihydrogen phosphate, disodium hydrogen phosphate, and sodium thioglycolate. The present study calculates the sample size based on the formula {N = Zα2 × [P × (1 − P)]/d2, α = 0.05, Zα = 1.96, d = 0.05}. The prevalence of C. psittaci in pigeon feces is p = 5.01% in Jilin Province, China [28]. According to the formula, the minimum sampling amount is N = 73. Considering sampling errors, market size, and sample types, the sample size has been expanded to 480 samples for the entire research plan. In total, 483 LPWM poultry and environmental samples were collected, consisting of 181 poultry samples (60 pharyngeal/cloacal swabs and 121 fecal samples) and 302 environmental samples (87 air samples, 24 sewage samples, 53 wash water samples, 47 drinking water samples, and 91 cage swabs).

Collection of avian pharyngeal/cloacal swabs

Polypropylene-tipped swabs (Yocon Biotechnology) were used to wipe the avian pharynx and cloaca 3–5 times each. The swabs were transferred to sampling tubes containing 3.5 mL of the sampling solution. Avian pharyngeal/cloacal swab samples were collected from each shop at each time point.

Collection of poultry fecal samples

Approximately 3–5 g of poultry fecal samples were collected from poultry housing and transferred into sampling tubes containing 3.5 mL of the sampling solution. Two samples were collected from each shop at each time point.

Collection of air samples

Two locations in each shop, next to the poultry housing and the feather removal machine, were selected as air sampling sites, with each sampling site located approximately 1.5 m above ground. An air sampler (Coriolis µ, Bertin Technologies, Aix-en-Provence, France) was used to collect air samples for 10 min at 200 L/min at each sampling site, directly into a small Erlenmeyer flask containing the sampling solution. Details of the collection and preservation methods are described in the literature [30] and the manufacturer’s instructions. Finally, the sampled liquid was transferred to the sampling tube, capped tightly, and labeled.

Collection of sewage samples

Disposable transfer pipettes (Huankai Microbial Science and Technology Co., Ltd. Guangdong, China) were used to collect 10 mL samples of sewage on the ground or in the sewers at each sampling point. The samples were transferred into a 15 mL sampling tube with an external screw cap. One sample was collected at each time point.

Collection of poultry drinking water and water used for washing slaughtered poultry samples

Disposable transfer pipettes (Huankai Microbial) were used to collect 10 mL of the sample from the poultry drinking water tank and another 10 mL of wastewater from the poultry washing and slaughtering station. The samples were transferred into sterilized 15 mL sampling tubes with external screw caps. One sample each of poultry drinking and wash water was collected from each shop at each time point.

All samples were transported at 4 °C, within 4 h of collection, to the laboratory of Changsha Center for Disease Prevention and Control, Changsha, China.

Polymerase chain reaction tests for C. psittaci in LPWM samples

Nucleic acid extraction from poultry and environmental samples was carried out using nucleic acid extraction kits (Tianlong Science and Technology, Xi’an, China). Briefly, 200 µL of each poultry and environmental sample was mixed well and added to the lysis buffer. Nucleic acids were automatically extracted from the samples using a magnetic bead system and corresponding reagent kits (Tianlong Science and Technology, Xi’an, China). The extracted nucleic acid samples were tested for C. psittaci using a real-time fluorescence PCR nucleic acid detection kit (Zijian Biotechnology, Shenzhen, China).

The reaction mixture comprised the following constituents: 19.0 µL of CPS PCR Buffer, 1.0 µL of CPS Enzyme Mix, 5.0 µL of template DNA, 5.0 µL of negative control, and 5.0 µL of positive control. The reaction conditions were as follows: 50 °C for 2 min, 95 °C for 3 min, and 40 cycles at 95 °C for 5 s and 60 °C for 45. The results were interpreted according to the manufacturer’s instructions.

Sequencing of C. psittaci DNA in LPWM samples

Based on the application of real-time fluorescence PCR for the detection of samples with CT values > 30 and the subsequent challenges in obtaining complete genome sequences, 17 poultry and environmental samples collected from an LPWM in Changsha during 2021–2022 that were C. psittaci-positive by real-time PCR (CT value < 30) were subjected to DNA extraction using the PureLink Genomic DNA Kits (Thermo Fisher Scientific, Carlsbad, CA, USA). The extracted DNA was amplified with PCR using the primers for the ompA gene (Cp-F1: 5ʹ-GTGAATTCTGATGCGAACGG-3ʹ; Cp-R1: 5ʹ-CTTGCCTGTAGGGAACCCAG-3ʹ). The reaction mixture comprised the following constituents: 12.5 µL of DreamTaq Green PCR Master Mix (2×) (Thermo Fisher Scientific, USA); 1.0 µL of Cp-F1; 1.0 µL of Cp-R1; 1.0 µL of template DNA; and 9.5 µL nuclease-free water. The reaction conditions were as follows: 95 °C for 2 min and 40 cycles at 95 °C for 30 s, 55 °C for 30 s, and 72 °C for 1 min, followed by incubation at 72 °C for 5 min. The C. psittaci-positive samples presenting the target band (1279 bp) were subjected to high-throughput nucleotide sequencing using the Illumina MiSeq sequencing system and kits (Illumina, San Diego, CA, USA).

Basic local alignment search tool comparison and molecular evolution analysis of C. psittaci ompA gene

Sequences of the ompA gene obtained by high-throughput nucleotide sequencing were analyzed and compared using BLAST. The amino acid sequences of C. psittaci downloaded from GenBank and the C. psittaci strains obtained in this study were compared using ClustalW in MEGA 6 software (https://www.megasoftware.net/). A molecular evolutionary tree was constructed using the maximum likelihood method and tested using a bootstrap test (1,000 iterations).

Statistical analysis

SPSS software (version 24.0; IBM SPSS, Armonk, NY, USA) was used for statistical analysis. Comparisons between positivity rates were performed using Fisher’s exact χ2 test. P values < 0.05 indicated statistical significance.

Results

LPWM poultry and environmental C. psittaci monitoring at different time-points

We found that 22 of 483 poultry and environmental samples collected from the LPWM during 2021–2022 tested positive for C. psittaci, with an overall positivity rate of 4.55%. The respective positivity rates in 2021 and 2022 were 3.47% (6/173) and 5.16% (16/310). Chlamydia psittaci was detected in samples collected in 83.33% of the sampling months (10/12), with samples collected in September 2022 having the highest positivity rate (10.64%), followed by samples collected in April 2022 (9.30%) and January 2021 (8.00%). Statistical analysis showed no differences in C. psittaci-positivity rates between samples collected in different months. The results are summarized in Table 1.

Table 1 PCR test results of Chlamydia psittaci in poultry and environmental samples from a live poultry wholesale market in Changsha at different time points from 2021–2022
Full size table

LPWM poultry and environmental C. psittaci monitoring at different sampling points

The 40 sampling points mainly consisted of pigeon, chicken, duck, chicken/duck, pigeon/chicken/duck/goose shops, market entrances, transportation vehicles, and other shops that sell animals (such as goats, sheep, and yellow cattle). Based on the sequential sampling principle, 483 samples were collected in 70 batches from the total sampling points (n = 40). Chlamydia psittaci was detected in the samples collected from 11 sampling points (positivity rate of 27.50%). Chlamydia psittaci-positivity rates differed significantly (P < 0.01) among samples collected from different sampling points, with the samples from the pigeon shop having the highest rate (46.67%). Except for shops that sold other animals, C. psittaci was detected in samples collected from all other sampling points, such as chicken and duck shops and the pigeon/chicken/duck/goose shops. The results are presented in Table 2; Fig. 2.

Table 2 Chlamydia psittaci PCR test results of samples collected from different sampling points at the Changsha live poultry wholesale market, 2021–2022
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Fig. 2
figure 2

Schematic of Chlamydia psittaci-positive sampling sites in the live poultry wholesale market. Notes

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Monitoring results of C. psittaci in different poultry and environmental samples at LPWM

Chlamydia psittaci-positivity rates differed significantly among the sample types (P = 0.04). Sewage samples had the highest positivity rate (12.5%), followed by poultry fecal samples (7.44%), cage swabs (6.59%), avian pharyngeal/cloacal swabs (3.33%), and air samples (2.29%). Chlamydia psittaci was not detected in the water used for washing slaughtered poultry or poultry drinking water samples. The results are summarized in Table 3.

Table 3 Results of Chlamydia psittaci polymerase chain reaction tests of poultry and environmental samples from LPWM in Changsha, 2021–2022
Full size table

Nucleotide sequencing and molecular evolution analysis of C. psittaci in the LPWM poultry and environmental samples

Two sequences of the ompA gene were successfully obtained using the Illumina MiSeq high-throughput nucleotide sequencing technique (GenBank accession numbers: OQ972011, OQ972012). BLAST similarity analysis showed that the nucleotide sequences of the two C. psittaci strains had the highest similarity (100%) with the C. psittaci strain CP3 with genotype B (GenBank accession number: CP003797.1), originating from pigeons in California, United States. Therefore, the genotypes of the two strains of C. psittaci were confirmed to be genotype B. Phylogenetic analysis showed that the ompA gene sequences of the two C. psittaci strains were located in the clusters of genotype B branches and closely related to the representative strains of C. psittaci with genotype B (GenBank accession numbers: AF269265 and AY762609, respectively), as shown in Fig. 3.

Fig. 3
figure 3

Phylogenic analysis of Chlamydia psittaci isolates based on the nucleotide sequence of the ompA gene. The C. psittaci strains isolated in this study are indicated by black circles

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Discussion

LPWMs mainly supply wholesale live poultry to local small- and medium-sized live poultry (farmers) markets. By monitoring C. psittaci in poultry and the environment of large LPWMs that supply live poultry, the status of poultry infections and environmental contamination by C. psittaci in local poultry markets can be evaluated to a certain extent. To the best of our knowledge, the present study is the first to conduct an environmental C. psittaci survey of an LPWM in China. In this study, C. psittaci genotype B was detected in the pigeon fecal samples obtained from LPWM in Changsha by monitoring during 2021–2022.

Recent studies have shown that many avian species are susceptible to C. psittaci infection [5]. For example, Liu et al. used cloacal or fecal swabs from domestic waterfowl, parrots, pigeons, and wild birds to determine the prevalence of C. psittaci in Taiwan during 2014–2017. They found that the prevalence of C. psittaci infection in waterfowl farms was as high as 34.2%. Moreover, 3.1% of samples collected from parrots were positive for C. psittaci of genotype A, 10.1% of samples collected from pigeons contained C. psittaci of genotype B, and the C. psittaci-positivity rate of samples collected from wild birds was 2.2% [31]. Yao et al. collected 399 pigeon fecal samples from Jilin Province, China, and found that the infection rate of C. psittaci in pigeons was 5.01% for all C. psittaci with genotype B [28].

Yin et al. [22] tested sera from Belgian and French chicken farms using ELISA for C. psittaci’s major outer membrane protein (MOMP). Belgian broilers, breeders, and layers had 96%, 93%, and 90% seropositivity, respectively, whereas French broilers had 91%. Chlamydia psittaci infections are emerging in chickens in Belgium and Northern France, posing a human psittacosis risk to chicken-processing plant employees [22]. Hulin et al. [23] confirmed high C. psittaci prevalence in French mule duck flocks. Environmental contamination, correlating with shedding dynamics, appears to be the main transmission pathway. High prevalence of bacteriophage Chp1, often coexisting with Chlamydia, suggests a key role in C. psittaci persistence, increasing human risk [23]. The present study showed that the C. psittaci-positivity rate in samples collected from an LPWM in Changsha in 2021–2022 was 4.55% (22/483) in poultry and environmental samples, 45.45% (10/22) in pigeon-related samples, 13.64% (3/22) in duck-related samples, and 9.09% (2/22) in chicken-related samples; however, it was not observed in other animal samples. The results suggest that pigeons, chickens, and ducks are the main source of environmental pollution caused by C. psittaci in the LPWM, and pigeons, chickens and ducks infected with C. psittaci pose cross-species transmission risks to human beings. Chlamydia psittaci-positive samples were detected in 83.33% of the sampling months (10 of 12 months), and the positivity rates of samples collected in different months did not vary significantly, suggesting the persistent presence of poultry infections and environmental contamination of C. psittaci in the LPWM.

Forty animal sales shops in the LPWM, including poultry shops, were selected as sampling points. The distribution map of the sampling points yielded positive samples showing that C. psittaci contamination was mainly found in pigeon, pigeon/chicken/duck/goose, and neighboring poultry shops. Chlamydia psittaci was also detected in other non-adjacent poultry shops, such as chicken and duck shops. However, other animal shops that were not spatially connected to poultry shops did not have detectable C. psittaci, suggesting aerosol transmission of C. psittaci between poultry shops that are spatially connected. For example, 5, 3, and 4 positive cases of C. psittaci were detected in adjacent stores L1, L27, and L28, respectively; 2 and 1 positive cases of C. psittaci were detected in adjacent stores L6 and L7, respectively; adjacent stores L9 and L10 both detected 1 positive case of C. psittaci.

In the present study, C. psittaci-positive poultry and environmental samples from the LPWM were predominantly fecal, cage swab, air, and sewage samples from the pigeon shop. C. psittaci was also detected in poultry fecal samples, duck pharyngeal/cloacal swabs, cage swabs, and air and sewage samples from other poultry (chickens and ducks) sampling sites. Therefore, in addition to the environmental samples associated with pigeon shops in the LPWM, some of the other poultry (chicken and duck) and their corresponding environmental samples were also C. psittaci-positive, suggesting a wide scope of LPWM poultry infection and environmental contamination of C. psittaci.

The findings imply that enhancement of the efficacy of cleaning and disinfecting LPWM environments is necessary. This study showed that the highest positivity rates were found in sewage (12.5%), poultry fecal (7.43%), cage swabs (6.59%), avian pharyngeal/cloacal swabs (3.33%), and air (2.29%) samples. It is recommended to centrally disinfect and discharge the sewage generated from the LPWM into the municipal sewage pipeline network, strengthen ventilation measures for the market and sales stores, and increase protective measures such as wearing gloves and masks for poultry sellers to avoid human infection with C. psittaci from the market environment [10].

Zhang et al. [20] reported the genotype of C. psittaci isolated from the human case from Shandong, China, is type A. Based on differences in the ompA gene, which encodes MOMP, C. psittaci was classified into 15 genotypes: A, B, C, D, E, F, E/B, MatI16, M56, CPX0308, WC, 6 N, 1 V, Daruma-1981, and R54, among which genotypes A to F, E/B, M56, and WC were the most common [29, 31,32,33,34]. In nature, avians are the main hosts of C. psittaci with genotypes A to F and E/B [32], whereas mammals host C. psittaci with genotypes M56 and WC [29, 33]. The pathogenicity of C. psittaci is genotype-dependent, with genotype A and D strains being highly virulent and causing acute infections in avian species, such as parrots and pigeons, whereas genotype A strains are commonly the culprits in human infections [31, 34]. When designing primers for nucleotide sequencing of C. psittaci, we prioritized enhancing the sensitivity of the primers over maximizing the specificity for C. psittaci. Consequently, the designed primers can identify C. psittaci as well as other Chlamydia strains, such as C. buteonis, C. abortus, and uncultured Chlamydia. Therefore, performing a BLAST similarity analysis on the nucleotide sequences obtained through sequencing is essential to verify the identified Chlamydia strains. The two C. psittaci strains used in this study were confirmed to be genotype B based on their ompA sequences. These two strains were detected in pigeon fecal samples, confirming that pigeons are susceptible to genotype B C. psittaci infections [28, 35, 36].

The limitation of this study was that the monitoring period for the LPWM was during the prevention and control phase of the COVID-19 outbreak. Thus, the time points for sample collection were affected, resulting in an irregular selection of sampling months. Moreover, the C. psittaci detected in the samples during the monitoring process was not isolated and cultured for identification. Another limitation of this study was that we did not attempt to identify other Chlamydia strains, such as C. avium, C. gallinacea, C. buteonis, or C. abortus.

Yin et al. reported 32 cases of human infection with C. psittaci in Zhejiang Province during 2020–2021; in all of these cases, individuals had a history of exposure to poultry or pigeons [18]. The present study detected C. psittaci in a local LPWM in Changsha, suggesting the need to develop preventive and control measures for human C. psittaci infection in the context of the increasing number of human C. psittaci infection cases. These measures involve strengthening the monitoring of C. psittaci in avian and public places, aimed at curbing the spread of pathogens from centralized pigeon suppliers, such as pigeon farms, to prevent C. psittaci infection.

Conclusions

Chlamydia psittaci genotype B was detected in the poultry and environmental samples from a poultry wholesale market in central China, indicating the need to further enhance environmental monitoring and disease prevention and control of C. psittaci in poultry wholesale markets.

Availability of data and materials

The datasets generated during and/or analyzed during the current study are available in Genbank [National Center for Biotechnology Information (https://www.ncbi.nlm.nih.gov/nuccore/OQ972011,OQ972012)] [Accession Nos: OQ972011 and Q972012].

Abbreviations

LPWM:

Live poultry wholesale market

References

  1. Teng XQ, Gong WC, Qi TT, Li GH, Qu Q, Lu Q, Qu J. Clinical analysis of metagenomic next-generation sequencing confirmed Chlamydia psittaci pneumonia: a case series and literature review. Infect Drug Resist. 2021;14:1481–92.

    Article  PubMed  PubMed Central  Google Scholar 

  2. Stidham RA, Richmond-Haygood M. Case report: possible psittacosis in a military family member-clinical and public health management issues in military settings. MSMR. 2019;26:2–7.

    PubMed  Google Scholar 

  3. Čechová L, Halánová M, Babinská I, Danisova O, Bartkovsky M, Marcincak S, et al. Chlamydiosis in farmed chickens in Slovakia and zoonotic risk for humans. Ann Agric Environ Med. 2018;25:320–5.

    Article  PubMed  Google Scholar 

  4. Wu HH, Feng LF, Fang SY. Application of metagenomic next-generation sequencing in the diagnosis of severe pneumonia caused by Chlamydia psittaci. BMC Pulm Med. 2021;21:300.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  5. Kaleta EF, Taday EM. Avian host range of Chlamydophila spp. based on isolation, antigen detection and serology. Avian Pathol. 2003;32:435–61.

    Article  CAS  PubMed  Google Scholar 

  6. Ojeda Rodriguez JA, Modi P, Brady MF. Psittacosis pneumonia. In: In: StatPearls Internet. Treasure Island (FL): StatPearls Publishing. 2022.

    Google Scholar 

  7. Shi Y, Chen J, Shi X, Hu J, Li H, Li X, et al. A case of Chlamydia psittaci caused severe pneumonia and meningitis diagnosed by metagenome next-generation sequencing and clinical analysis: a case report and literature review. BMC Infect Dis. 2021;21:621.

    Article  PubMed  PubMed Central  Google Scholar 

  8. Chaber AL, Jelocnik M, Woolford L. Undiagnosed cases of human pneumonia following exposure to Chlamydia psittaci from an infected Rosella parrot. Pathogens. 2021;10:968.

    Article  PubMed  PubMed Central  Google Scholar 

  9. Zuzek R, Green M, May S. Severe psittacosis progressing to suspected organizing pneumonia and the role of corticosteroids. Respir Med Case Rep. 2021;34:101486.

    PubMed  PubMed Central  Google Scholar 

  10. Tolba HMN, Abou Elez RMM, Elsohaby I. Risk factors associated with Chlamydia psittaci infections in psittacine birds and bird handlers. J Appl Microbiol. 2019;126:402–10.

    Article  CAS  PubMed  Google Scholar 

  11. Ferreira VL, Silva MV, Bassetti BR, Pellini ACG, Raso TF. Intersectoral action for health: preventing psittacosis spread after one reported case. Epidemiol Infect. 2017;145:2263–8.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  12. Mair-Jenkins J, Lamming T, Dziadosz A, Flecknoe D, Stubington T, Mentasti M, et al. A psittacosis outbreak among English office workers with little or no contact with birds, August 2015. PLoS Curr. 2018;10:ecurrents.outbreaks.b646c3bb2b4f0e3397183f31823bbca6.

    PubMed  PubMed Central  Google Scholar 

  13. Solorzano-Morales A, Dolz G. Molecular characterization of Chlamydia species in commercial and backyard poultry farms in Costa Rica. Epidemiol Infect. 2022;150:1–18.

    Article  PubMed  Google Scholar 

  14. de los Espinosa MT, Laguna Sorina JA, Rueda da Domingo MT, López Hernández B, Bermejo Pérez MJ, Sabonet JC. Brote de psitacosis en Granada [Psittacosis outbreak in Granada, Spain]. Rev Esp Salud Publica. 2005;79:591–7.

    Article  Google Scholar 

  15. Missault S, De Meyst A, Van Elslande J, Van den Abeele AM, Steen E, Van Acker J, et al. Three cases of atypical pneumonia with Chlamydia psittaci: the role of laboratory vigilance in the diagnosis of psittacosis. Pathogens. 2022;12:65.

    Article  PubMed  PubMed Central  Google Scholar 

  16. Wreghitt TG, Barker CE, Treharne JD, Phipps JM, Robinson V, Buttery RB. A study of human respiratory tract chlamydial infections in Cambridgeshire 1986-88. Epidemiol Infect. 1990;104:479–88.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  17. Centers for Disease Control and Prevention. Compendium of measures to control Chlamydia psittaci infection among humans (psittacosis) and pet birds (avian chlamydiosis), 2000. MMWR Recomm Rep. 2000;49:3–17.

    Google Scholar 

  18. Yin Q, Li Y, Pan H, Hui T, Yu Z, Wu H, et al. Atypical pneumonia caused by Chlamydia psittaci during the COVID-19 pandemic. Int J Infect Dis. 2022;122:622–7.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  19. Shaw KA, Szablewski CM, Kellner S, Kornegay L, Bair P, Brennan S, Kunkes A, et al. Psittacosis outbreak among workers at chicken slaughter plants, Virginia and Georgia, USA, 2018. Emerg Infect Dis. 2019;25:2143–5.

    Article  PubMed  PubMed Central  Google Scholar 

  20. Zhang Z, Zhou H, Cao H, Ji J, Zhang R, Li W, et al. Human-to-human transmission of Chlamydia psittaci in China, 2020: an epidemiological and aetiological investigation. Lancet Microbe. 2022;3:e512-520.

    Article  PubMed  Google Scholar 

  21. Jin W, Liang R, Tian X, Cheng Y, Kong X, He F, et al. Clinical features of psittacosis in 46 Chinese patients. Enferm Infecc Microbiol Clin (Engl Ed). 2023;41:545–8.

    Article  PubMed  Google Scholar 

  22. Yin L, Kalmar ID, Lagae S, Vandendriessche S, Vanderhaeghen W, Butaye P, et al. Emerging Chlamydia psittaci infections in the chicken industry and pathology of Chlamydia psittaci genotype B and D strains in specific pathogen free chickens. Vet Microbiol. 2013;162:740–9.

    Article  PubMed  Google Scholar 

  23. Hulin V, Bernard P, Vorimore F, Aaziz R, Cléva D, Robineau J, et al. Assessment of Chlamydia psittaci shedding and environmental contamination as potential sources of worker exposure throughout the mule duck breeding process. Appl Environ Microbiol. 2015;82:1504–18.

    Article  CAS  PubMed  Google Scholar 

  24. Wan XF, Dong L, Lan Y, Long LP, Xu C, Zou S, et al. Indications that live poultry markets are a major source of human H5N1 influenza virus infection in China. J Virol. 2011;85:13432–8.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  25. Yang PF, Yan QL, Liu CC, Xing YD, Zhang MH, Gao Q, et al. Characterization of avian influenza A (H7N9) virus prevalence in humans and poultry in Huai’an, China: molecular epidemiology, phylogenetic, and dynamics analyses. Biomed Environ Sci. 2016;29:742–53.

    PubMed  Google Scholar 

  26. Zhang T, Bi Y, Tian H, Li X, Liu D, Wu Y, et al. Human infection with influenza virus A (H10N8) from live poultry markets, China, 2014. Emerg Infect Dis. 2014;20:2076–9.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  27. Wang W, Artois J, Wang X, Kucharski AJ, Pei Y, Tong X, et al. Effectiveness of live poultry market interventions on human infection with avian influenza A(H7N9) virus, China. Emerg Infect Dis. 2020;26:891–901.

    Article  PubMed  PubMed Central  Google Scholar 

  28. Yao QX, Zhang XX, Chen K, Ma JG, Zheng WB, Xu XQ, et al. Prevalence and genotypes of Chlamydia psittaci in pigeons in Jilin Province, Northeastern China. Chin J Zoonoses. 2017;33:104–9.

    Google Scholar 

  29. Feng Y, Feng YM, Zhang ZH, Wu SX, Zhong DB, Liu CJ. Prevalence and genotype of Chlamydia psittaci in faecal samples of birds from zoos and pet markets in Kunming, Yunnan, China. J Zhejiang Uni Sci B. 2016;17:311–6.

    Article  Google Scholar 

  30. Zhou J, Wu J, Zeng X, Huang G, Zou L, Song Y, et al. Isolation of H5N6, H7N9 and H9N2 avian influenza a viruses from air sampled at live poultry markets in China, 2014 and 2015. Euro Surveill. 2016;21:30331.

    Article  PubMed  PubMed Central  Google Scholar 

  31. Liu SY, Li KP, Hsieh MK, Chang PC, Shien JH, Ou SC. Prevalence and genotyping of Chlamydia psittaci from domestic waterfowl, companion birds, and wild birds in Taiwan. Vector Borne Zoonotic Dis. 2019;19:666–73.

    Article  PubMed  Google Scholar 

  32. Pang Y, Cong F, Zhang X, Li H, Chang YF, Xie Q, et al. A recombinase polymerase amplification-based assay for rapid detection of Chlamydia psittaci. Poult Sci. 2021;100:585–91.

    Article  CAS  PubMed  Google Scholar 

  33. Mattmann P, Marti H, Borel N, Jelocnik M, Albini S, Vogler BR. Chlamydiaceae in wild, feral and domestic pigeons in Switzerland and insight into population dynamics by Chlamydia psittaci multilocus sequence typing. PLoS One. 2019;14:e0226088.

  34. Favaroni A, Trinks A, Weber M, Hegemann JH, Schnee C. Pmp repertoires influence the different infectious potential of avian and mammalian Chlamydia psittaci strains. Front Microbiol. 2021;12:656209.

  35. Dolz G, Solórzano-Morales Á, Angelova L, Tien C, Fonseca L, Bonilla MC. Chlamydia psittaci genotype B in a pigeon (Columba livia) inhabiting a public place in San José, Costa Rica. Open Vet J. 2013;3:135–9.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  36. Madani SA, Peighambari SM. PCR-based diagnosis, molecular characterization and detection of atypical strains of avian Chlamydia psittaci in companion and wild birds. Avian Pathol. 2013;42:38–44.

    Article  CAS  PubMed  Google Scholar 

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Acknowledgements

We would like to thank Editage (www.editage.cn) for English language editing.

Funding

This work was supported by the Hunan Provincial Natural Science Foundation of China (grant numbers: 2022JJ70131, 2023JJ60399); the Scientific Research Project of Hunan Provincial Health Commission (Grant numbers: 202212064383, 202212064269); Natural Science Foundation of Changsha (Grant number: kq2202040). All the funders provided funding for data collection, data analysis, and preparation of the manuscript.

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Authors and Affiliations

  1. Changsha Center for Disease Prevention and Control, Changsha, Hunan, 410007, China

    Rusheng Zhang, Huiyuan Fu, Can Luo, Zheng Huang, Ruiqing Pei, Yu Di, Caiying Zhu, Shan Chen, Jingfang Chen, Mingzhong Xu, Xuewen Yang & Rengui Yang

  2. Public Health College, University of South China, Hengyang, Hunan, 421001, China

    Jiayi Peng & Huiqi Hu

  3. Changsha Kaifu Disease Prevention and Control Center, Changsha, Hunan, 410007, China

    Lamei Chen

  4. Changsha Hospital of Traditional Chinese Medicine (Changsha Eighth Hospital), Changsha, Hunan, 410125, China

    Rengui Yang

Authors
  1. Rusheng Zhang
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  2. Huiyuan Fu
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  3. Can Luo
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Contributions

RZ analyzed and discussed the detection results of C. psittaci from LPWM and was a major contributor in writing the manuscript. HF performed nucleic acid testing of the samples from LPWM, gene sequencing, and analysis on gene data. CL performed sample collection, data analysis, and statistical analysis. ZH performed sample collection, gene sequencing, and evolutionary analysis. RP, YD, and CZ performed sample collection, nucleic acid testing, and result analysis. JP, HH, and SC performed sample collection and nucleic acid testing. JC, LC, MX, and XY performed quality control, work coordination, and information collection. RY led the project, discussed the outcomes, revised the paper, and was a major contributor in writing the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Rengui Yang.

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Ethics approval and consent to participate

This study was approved by the Medical Ethics Committee of Changsha Center for Disease Control and Prevention (Approval Number: CSCDC-2021-02). Consent to participate was not applicable.

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Not applicable.

Competing interests

The authors declare no competing interests.

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Zhang, R., Fu, H., Luo, C. et al. Chlamydia psittaci detected at a live poultry wholesale market in central China. BMC Infect Dis 24, 585 (2024). https://doi.org/10.1186/s12879-024-09478-8

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Keywords

BMC Infectious Diseases

ISSN: 1471-2334

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